Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ
Patent
1989-09-26
1991-02-05
Foelak, Morton
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
55 16, 21050022, 21050023, 21050036, 21050042, 26417717, 264178R, 2642091, 521 61, 521 64, 521134, 521145, C08L 926, B01D 1300
Patent
active
049902946
ABSTRACT:
Microporous or open ultrafiltration poly (tetrafluoroethylene-co-perfluoro-(alkyl vinyl ether)) (PFA) or poly (tetrafluoroethylene-co-hexafluoropropylene) (FEP) film membrane or hollow fibers having open pores are formed from a melt blend of 10 to 35 weight percent of the PFA or FEP and a chlorotrifluoroethylene oligomer solvent. The melt blend is shaped and one or more surfaces of the shaped melt blend are coated with the solvent prior to phase separation of the melt blend. Coating the membrane with solvent during shaping results in membrane having larger pores on that membrane surface as compared to membranes not coated with solvent. The shaped melt blend is cooled to effect phase separation and crystallization of the PFA or FEP from the blend. The solvent is separated from the PFA or FEP by extraction and the porous PFA or FEP is heat set under restraint to prevent shrinkage. In one embodiment of this invention the dry film membrane recovered after extraction or the membrane wet with extraction liquid is stretched in the cross-web direction to below its breaking limit, dried, restrained and then heat-set.
REFERENCES:
patent: 4902456 (1990-02-01), Yen et al.
Lopatin George
Malarkey Howard
Soane David
Yen Larry Y.
Cook Paul J.
Foelak Morton
Karnakis Andrew T.
Millipore Corporation
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